波长和强度同时响应的锥形多模光纤温度传感器

通过将一段长为17 mm的多模光纤两端分别与单模光纤对芯熔接，然后对多模光纤部分进行拉锥处理，得到一种波长和强度同时对温度响应的锥形多模光纤温度传感器。实验研究了30 ℃~80 ℃范围内传感器的温度传感特性。实验结果表明:当环境温度发生变化时，该传感器在1 542 nm附近干涉波谷的波长和强度对温度的响应灵敏度分别可达到0. 041 nm/℃和0. 106 dB/℃，并且传感器干涉条纹的波长响应和强度响应之间呈良好的线性关系。基于传感器波长响应与强度响应之间的该线性关系，通过传感信号强度的检测即可实现干涉型光纤传感器的相位解调，该方法为传感解调信号提供了新思路，具有重要的参考价值。

Tapered multi-mode fiber temperature sensor based on simultaneous response of wavelength and intensity

By combining ends of a multimode fiber with a length of 17 mm and single-mode fiber(SMF), multimode fiber is then subjected to a tapered treatment to obtain a tapered multimode fiber with a wavelength and intensity sensor. Temperature sensing characteristics of sensor in range of 30 ℃ ~ 80 ℃ were studied experimentally. Experimental results show that when ambient temperature changes, response sensitivity of sensor to temperature of interference trough near 1 542 nm can reach 0. 041 nm / ℃ and 0. 106 dB / ℃ respectively, and there is a good linear relationship between wavelength response and intensity response of sensor interference fringe. Based on this linear relationship between sensor wavelength response and intensity response, phase demodulation of interferometric fiber optic sensor can be realized by detecting intensity of sensor signal. This method provides a new idea for sensing and demodulating signal value.